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to take a 3 to 10 second chug of hard liquor straight from the bottle in order to get significantly drunk extremely quickly.

less than three seconds is NOT a shwack.
dude, i remember taking a ten second shwack... and nothing else.
by buttholio_portfolio September 18, 2010
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4
a whole shitload, usually used to describe illicit substances....or beer.
Wow! I didn't know you were gonna get a thousand pills. Dude thats a shwack of E man.
by chinesemaster8 July 26, 2006
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5
Shwack is another way to say masturbate. My friend is named Shwack because he shwacks a lot.
i shwack two times in the morning, i shwack two times at night. I shwack two times in the afternoon, it makes me feel alright. I shwack two times in time of peice and two in time of war. I shwack to times before i shwack two times and then i shwack two more.
by Shwack September 18, 2005
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6
to jump onto or cut apart trees or bushes with your snowboard.
damn, did you just see him shwack that bush. that was sick. My turn!
by hyborian November 27, 2003
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